"We also reported the matter to police who are now handling these allegations."

Drivers will have to undergo a re-test to confirm they are entitled to hold their licence. VicRoads CEO Gary Liddle says the department will cover the cost. Those who do not sit the test will have their licence cancelled.

VicRoads has written to the Anglesea Complex demanding it show cause why its right to provide heavy vehicle testing services on behalf of VicRoads.

The company raised the alarm about the breaches and is now assisting authorities with their investigation.

"It’s not necessary to automatically cancel all the heavy vehicle licences issued by the Anglesea Complex because not all drivers were tested by the person accused of misconduct," Liddle says.

"VicRoads is taking this action because we cannot allow any truck drivers who have not gone through the proper licence processes to drive on our roads."